Screening device



Sept. 36, 1924. I 1 ,510,058

R.D.HELLER SCREENING DEVICE Filed April 4. 1921 INVENTOR ORNEY5 Patented lieptw 30, 1924.

UNITED STATES PATENT OFFICE.

RICHARD D. HELLER, 0F BOISE, TDAHO.

SCREENING DEVICE,

Application filed April 4,

To all whom, it may concern:

Be it known that I, RIC-HARD D. HELLER, a. citizen of the United States of America, and resident of the city of Boise, in the county of Ada and State of Idaho, have invented certain new and useful Improvements in Screening Devices, of which the following is a specification.

My invention relates to screening devices which are particularly intended for removing the seeds and other like debris from the water flowing in irrigation ditches. The present application is an improvement upon my era-pendingapplication Serial No. 382,189.

it is the principal object of my presei-it invention to provide means constituting a largely increased screening capacity whereby a large amount of seedsand debris may be removed from the irrigation water without the necessity of constant attei-i-ti-on and without the necessity of having to clean out the screen constantly.

Another object of my invention is to provide an improved screening device whereby the various classes of debris may be more conveniently removed.

Another object of my invent-ion is to provide means employing primary and. secondary screening elements, whereby considerable percentage of the water may be separated out by the primary screening mechanism, whereby the amount of water to be passed when removing the dbris is largely reduced, thereby reducing the screen area needed.

My invention comprises those novel parts and combinations thereof which are shown in the accompanying drawings, described in the specification, and particularly defined by the claims terminating the same.

In the accompanying drawings I have shown my invention in the form which is now preferred by me.

Figure 1 is a longitudinal section through an irrigation ditch and tlume and through my screening device. t

Figure 2 is a transverse section through the flume and ditch, showing my device in elevation.

My previous invent-ion consisted of only a single screening element which removed the debris from the water in a single operation and deposit-ed the debris in a bucket or container which it was necessary to clean I92 Serial No. 455,37l.

out at frequent intervals. The storage capacity for debris was only a portion of the volume of the screening bucket or c011- taincr. By my present invention the primary screening elementis employed only to remove a large portion of the water. The remainder is delivered, with the debris, into a secondary screening member which may be of greater or less capacity, as desired, and which will remove the debris and seeds, and which may be made of a capacity such that it needs but infrequent cleaning out. By this expedient "the amount of water which must he passed through the dhris-retai-nin g screens is very much reduced, permitting, an increased reduction in the area of screen needed to pass it. i

The primary screening element may be similar to that shown in my co-pending application referred to above. It comprises a series of ballies l and 10 secured together upon the rod 11, and by means of the bars 12 connecting points in their peripheries, the whole being insertible in guides 21 of a screening bucket or container 2. The container 2 being made of screening material, and the battles 1 and 10 being arranged to deflect water entering the container outward and through the mesh of the bucket 2, most of the water which enters the container will be eliminated through the sides of the container 2, Additional baffles 22 upon the outside of the bucket 2 serve to deflect the water which is running down the side of the bucket, in this manner to permit additional water to pass through the bucket. The particular form of the primary screening element is, however, largely immaterial, and that described is merely illustrative. The primary screening element, however, should be such as to eliminate a large port ionof' the water entering the container.

Beneath the container 2 is provided a flume 3 which receives the unscreened water which drops through the container 2 and its baillcs 1. The container 2 may terminate at its lower end in a funnel 31 which connects with the Flume and which directs the water from the container 2 into the flume. The tlume adjacent the container 2 is preferably covercd, as by a cover 32-, upon which water Screened through the bucket 2 may fall and from which it will drain, not into the flume 3 but into the ditch elbelow the fiume. I may also provide a splash plate 33 upstanding from the cover 32 and located at a distance from the container 2. This splash plate prevents water overflowing from the cover 32 into the fiume 3, and prevents water falling upon the-cover from splashing over into the flume. This may be of any height desired.

In the flume 3 I provide secondary screening members which act upon the unscreened water which drops through the primary screen and which remove therefrom the debris and seeds. The secondary screening members which I have shown consists of screens 34 which extend transversely across the fiume from one side to the other. These screens 34 are preferably sloped backward against the flow of water. They should stop sufficiently below the top of the flume to provide overflow capacity sufiicient to carry the water when the screens become clogged. They may also be of progressive increasing height in the direction away from the primary screen. Thus the first of these screens 34 will remove the debris until it is banked up so that it has an insuflicient carrying capacityrthe water will then flow over this screen. The second screen then starts'to remove the debris until it has been so clogged with debris that all the water will not flow therethrough. The same process continues for the third and fourth and so on for as many screens as may be provided; In this manner the debris storage capacity of the secondary screening'member may be increased to any reasonable extent without increasing the size of the flume or the individual screens, and frequent cleaning of the screens is thus eliminated.

The screens 34 are supported in inclined guides 35 secured to the side walls of the flume 3. In this manner they may be re moved for cleaning and again replaced. It may be desirable to provide the various screens 34 with varying size mesh. The first of these screens would then be of the largest mesh to remove the large debris, the next of somewhat finer mesh to remove finer debris, and soon. This, however, is not an essential part of my invention, but a refinement which may be desirable in certain cases.

The screening device in its entirety is positioned with the flume 3 supported above an irrigation ditch 4 so that it will finally deliver the screened water into the ditch. The primary screen is placed beneath the outlet of a ditch 40 and water from the ditch 40 is delivered directly into the container 2; There a large portion of the water is screened and drained into the ditch 4 as described above. The remainder, passing into the fiume 3, is screened and the debris eliminated, whereupon the screened water falls into the ditch 4. At intervals the des.

vice may be cleaned by removing the screens 34 and collecting the debris gathered behind them.

By employing a series of screens spaced along a flume and of a height which will furnish suflicient flow capacity over their top when the screen becomes clogged by the screened material, a very much greater screening capacity is provided for a given size of flame. When the first flume becomes clogged, the second will begin functioning and when this becomes clogged the next will begin functioning.

hat I claim as my invention is:

1. The combination with a primary selfcleaning screen for the elimination of a considerable percentage of the water, of a flow channel for receiving the unscreened water and the debris, having a series of screens adapted to be overflowed when clogged, and to successively function to retain the debris as the preceding screens of the series become clogged.

2. In a device of the character described, in combination, a primary water eliminating and debris-passing screen, a fiume receiving the water not eliminated by the primary screen together with the debris, and a series of upright screens in said fiulne progressively increasing in height with their distance away from the primary screen.

3. In a device of the character described, in combination, a primary screen, a filune therebeneath to receive the water not eliminated by the primary screen together with the debris, means for preventing screened water falling into the flumc, and, secondary screening elements positioned in said flnme to successively function as the preceding screens become clogged.

4. In a device of the character described, in combination, a primary screen, a fiume receiving the water not eliminated by the primary screen, together with the debris, a cover for said fiume adjacent the primary screen to prevent screened water falling into the. fiume, and secondary screening elements in said flume.

5. In a device of the character described, in combination, a primary screen, a llume therebeneath to receive the debris and the water not eliminated by the primary screen, a cover for said fiume adjacent the primary screen to prevent screened water falling into the flame, a splash plate upstanding from said cover t'ansversely thereof, and second.- ary screening elements in said flume.

6. In a device of the character described, in combination, a cylinder of screenin material, baflles therein arranged to efleet water outwardly through the screening cylinder, a flume therebeneath, a funnel connecting said flume and the bottom of the cylinder, secondary screening elements in said fiume, and means for preventing water llll'i screened through said cylinder from falling nisin receiving the nnscreened Water and the Within said flnlne. debris and containing means for catching 7. In :1 device of the character described, and holding the dhris and permitting the 10 in combination, means for preliminarily escape of the Water. screening out a large portion of the water Signed at Ynkinm, Ynhin'm County, While passing on the remainder of the Wiltfil' \Vaehington, this 31 day of March, 1921. and the dhris, a secondary screening lnecha- RICHARD D. HELLER. 

